A 0.018% THD+N, 88-dB PSRR PWM Class-D Amplifier for Direct Battery Hookup

A low-distortion third-order class-D amplifier that is fully integrated into a 0.18-μ m CMOS process was designed for direct battery hookup in a mobile application. A class-D amplifier for direct battery hookup must have a sufficiently high power supply rejection ratio (PSRR) in preparation for nois...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits Vol. 47; no. 2; pp. 454 - 463
Main Authors: Choi, Youngkil, Tak, Wonho, Yoon, Younghyun, Roh, Jeongjin, Kwon, Sunwoo, Koh, Jinseok
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.02.2012
Institute of Electrical and Electronics Engineers
Subjects:
Amplifiers
Applied sciences
Batteries
Circuit properties
Class-D amplifier
delta-sigma (\Delta\Sigma) modulation
Design. Technologies. Operation analysis. Testing
efficiency
Electric, optical and optoelectronic circuits
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Frequency filters
Generators
Integrated circuits
Mathematical model
Noise
power supply rejection ratio (PSRR)
Pulse width modulation
pulse-width modulation (PWM)
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Switches
total harmonic distortion plus noise (THD+N)
Performance evaluation
Output power
LC circuit
Non linear filter
Power supply
total harmonic distortion plus noise (THD+N)
Sigma-delta modulation
Complementary MOS technology
pulse-width modulation (PWM)
Harmonic distortion
Feedforward
Rejection ratio
Modulator
efficiency
Electronic filters
Third order
Printed circuit board
Secondary cell
Power electronics
Amplifier
Continuous time filters
power supply rejection ratio (PSRR)
Class-D amplifier
High power
Printed circuit
Pulse duration modulation
delta-sigma (ΔΣ) modulation
Passive filter
Power transmission line
ISSN:0018-9200, 1558-173X
Online Access:Get full text
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Summary:A low-distortion third-order class-D amplifier that is fully integrated into a 0.18-μ m CMOS process was designed for direct battery hookup in a mobile application. A class-D amplifier for direct battery hookup must have a sufficiently high power supply rejection ratio (PSRR) in preparation for noise, such as when a global system for mobile communications (GSM) bursts ripples through the system power line. This amplifier has a high PSRR of 88 dB for 217-Hz power supply ripples, using a third-order loop filter. System performance and stability are improved by applying the design technique of input-feedforward delta-sigma (ΔΣ) modulators to the pulse-width modulation (PWM) class-D amplifier. A filterless method that can remove the external LC filter is employed, which offers great advantages in terms of PCB space and system cost. This amplifier achieves a power efficiency of 85.5% while delivering an output power of 750 mW into an 8-Ω load from a 3.7-V supply voltage. Maximum achieved output power at 1% total harmonic distortion plus noise (THD+N) from a 4.9-V supply voltage into an 8-Ω load is 1.15 W. This class-D amplifier is designed to have a broad operational range of 2.7-4.9 V for the direct use of mobile phone battery power. It has a total area of 1.01 mm 2 and achieves a THD+N of 0.018%.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2011.2170770